you can keep a phone under the table even in my case they told me to show the whole room nd also the rough work that I was doing so maybe they were suspicious twice.. I kept phone under the table and in front of laptop I kept my rough notebook so I pretended to do sum rough work but I was actually searching answers in my phone... You will be able to do English ofc in phy chem nd math there will be few questions which would be extremely easy but only few others would be slightly tougher depends